Alt-BEAM Archive
Message #03851
To: beam@sgiblab.sgi.com
From: BotDoc botdoc@yahoo.com
Date: Thu, 27 May 1999 22:19:27 -0700 (PDT)
Subject: [alt-beam] edge detector
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Hey list,
Here is a little edge detector schematic that uses 1
NPN transistor, 1 resistor and 2 photoresistors. It
has an active low output that drains 23uA at 3.1V.
The photoresistors should be a close together in value
as possible, facing down, and about half of centimeter
or so above the ground. It is triggered when the
front sensor goes off of a desk (white), assuming that
light isn't coming from your floor. It will also avoid
things such as ink blots on your desk etc. Flip the
photoresistors so they are facing up, and you can
reverse before getting stuck in a shadow... Might be
something to thow on your photovores.
BotDoc
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Attachment: edge detector.JPG
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3852 Fri, 28 May 1999 00:24:22 -0500 [alt-beam] Re: cheap eletronics!!!! beam "Jesse D." I did find some good kits there, like an ultrasonic motion detector set
for $25
cheapest ive seen..
also DTMF encoders/decoders...
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